> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.esimplans.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# What is eSIM

The term "eSIM" means an embedded SIM card. It allows you to activate and use a cellular plan from your carrier without having to insert a physical SIM card.

EsimPlans eSIM is installed on all [eSIM compatible devices](/en/article/what-devices-support-esim-hbat5g/) and provides you with mobile internet access in over 100 countries.

NOTE: EsimPlans eSIM is for mobile data only. It does not have a phone number. So you can't use it for offline calling, but you can switch between an eSIM and a physical SIM at any time.